Distribution device with incrementally added splitters

ABSTRACT

A fiber distribution system (10) includes a fiber distribution hub (20, 300); at least one fiber distribution terminal (30, 100); and a cable (40) wrapped around a spool (110) of the fiber distribution terminal (30, 100). The fiber distribution terminal (30, 100) includes a spool (110) and a management tray (120) that rotate together. A second connectorized end (40b) of the cable (40) is held at a fiber optic adapter (125) on the tray (120). After dispensing the first connectorized end (40a) to the hub (20), an optical splitter (70, 130, 140) can be mounted to the tray (120). The splitter (26, 70, 130, 140, 306) has output adapters at which patch cords (50) can be inserted to connect subscribers to the system. The fiber distribution hub can use the same format of splitters (26, 70, 130, 140, 306). Other distributed splitter systems are provided with splicing and/or adding of splitters as needed.

This application is a Continuation of U.S. patent application Ser. No. 14/653,888, filed on 19 Jun. 2015, now U.S. Pat. No. 10,031,305, which is a National Stage Application of PCT/EP2013/077292, filed on 19 Dec. 2013, which claims benefit of U.S. Provisional Ser. No. 61/739,461, filed on 19 Dec. 2012, U.S. Provisional Ser. No. 61/840,832, filed on 28 Jun. 2013, U.S. Provisional Ser. No. 61/883,320, filed on 27 Sep. 2013, and U.S. Provisional Ser. No. 61/908,054, filed on 23 Nov. 2013 and which applications are incorporated herein by reference. To the extent appropriate, a claim of priority is made to each of the above disclosed applications.

BACKGROUND

As demand for telecommunications increases, fiber optic networks are being extended in more and more areas. In facilities such as multiple dwelling units (MDU's), apartments, condominiums, businesses, etc., fiber optic distribution terminals are used to provide subscriber access points to the fiber optic network. Fiber optic distribution terminals are often installed at separate floors of an MDU and are connected to the fiber optic network through cables connected to a network hub. The length of cable needed between the fiber optic enclosure and the network hub varies depending upon the location of the fiber optic enclosure with respect to the network hub. As a result, there is a need for a fiber optic enclosure that can effectively manage varying lengths of cable. Cables are also used to interconnect the subscriber access points provided by the fiber distribution terminals with subscriber interface units (e.g., Optical Network Terminals) provided at subscriber locations (e.g., at each residence of an MDU). With respect to such fiber distribution systems, there is also a need for techniques to effectively manage excess cable length while also taking into consideration space constraints.

SUMMARY

One aspect of the present disclosure relates to a fiber distribution device including a rotatable arrangement about which a length of fiber optic cable is coiled. The fiber optic cable includes at least one optical fiber contained within a cable jacket. An optical splitter can be added to the fiber distribution device subsequent to deployment of the fiber distribution device (e.g., when service is requested) from the fiber distribution device.

In some implementations, the optical splitter has a configuration that enables subsequent installation of the splitter in the device.

In some implementations, the input of the optical splitter may include either an adapter port or a connector configured to be received at an adapter port.

Another aspect of the present disclosure relates to a fiber distribution system including a fiber distribution hub and one or more fiber distribution devices that can be installed at different locations within a building. Both the hub and the device can be initially deployed without splitters.

In certain implementations, the device can be deployed with no output adapters at which subscriber patch cords can be connected to the device.

In certain implementations, the hub can be deployed with no output adapters at which cables dispensed from the devices can be connected to the hub.

Optical splitters having adapter output ports can be incrementally installed at the hub and/or the devices.

In certain implementations, the output splitters of the hub and devices are interchangeable with each other.

Another aspect of the present disclosure relates to an optical splitter module including a splitter body, a splitter input region, and a splitter output region. The splitter body holds an optical splitter that splits signals received at the input region to the output region of the module. The splitter output region includes two or more optical adapters having empty, outward-facing ports. The splitter input region of certain types of splitter modules includes one or more optical adapters having an empty, outward-facing port. The splitter input region of other types of splitter modules includes an optical connector.

In some examples, the input region is disposed at a notched region of the body so that a splitter input port or connector is inwardly recessed from the splitter output ports.

The optical splitter held within the splitter body can have any of a variety of ratios (e.g., 1:2, 1:4, 1:8, 1:16, 1:32, 1:64, etc.). In certain examples, a first splitter module can have a first splitter body holding an optical splitter having a first split ratio (e.g., 1:4) and a second splitter module can have a second splitter body holding an optical splitter having a second split ratio (e.g., 1:8) wherein the first and second splitter bodies have the same dimensions. Some splitters can be 2:4 or 2:8, with two inputs and 4 outputs or eight outputs for each input.

In certain implementations, the output region of the first splitter module has the same dimensions as the output region of the second splitter module.

In certain implementations, the splitter modules can include fiber optic connector storage locations for extra and connector or connectors.

Another aspect of the disclosure relates to a fiber distribution hub including an enclosure, a plurality of fiber optic splitters mounted within the enclosure and a plurality of fanouts mounted to the enclosure. Each of the fanouts includes a splice region for splicing riser cables to connectorized pigtails that lead to outputs of the fiber optic splitters, wherein inputs of the fiber optic splitters receive fibers spliced from a feeder cable entering the enclosure.

Another aspect of the disclosure relates to a fiber distribution hub including an enclosure, a plurality of fiber optic splitters mounted within the enclosure and a plurality of integrated splice and cable termination devices mounted to the enclosure. Each of the splices is on a pivotally mounted tray includes a splice region for splicing cables to connectorized pigtails that lead to inputs and/or outputs of the fiber optic splitters.

Another aspect of the present disclosure relates to a fiber distribution device including a length of fiber optic cable with a connectorized end matable to an adapter for connecting to either a fiber optic connector and a cable or a fiber optic splitter with a plurality of outputs. An optical splitter can be added to the fiber distribution device subsequent to deployment of the fiber distribution device (e.g., when service is requested) from the fiber distribution device. The optical splitter has a configuration that enables subsequent installation of the splitter in the device. The input of the optical splitter may include either an adapter port or a connector configured to be received at an adapter port.

A variety of additional aspects will be set forth in the description that follows. These aspects can relate to individual features and to combinations of features. It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the broad concepts upon which the embodiments disclosed herein are based.

DRAWINGS

FIG. 1A is a schematic view of a fiber optic distribution system in accordance with the principles of the present disclosure shown incorporated into a multi-dwelling unit;

FIG. 1B is a schematic view of the fiber optic distribution system of FIG. 1A after the initial installation and prior to a service request;

FIG. 2 is a front perspective view of an example fiber distribution terminal with a cover disposed in a closed position;

FIG. 3 is a front perspective view of the fiber distribution terminal of FIG. 2 with the cover removed so that a rotatable arrangement is visible;

FIG. 4 is a rear perspective view of the fiber distribution terminal of FIG. 3 with the rotatable arrangement exploded from a base;

FIG. 5 is a front perspective view of the fiber distribution terminal of FIG. 4;

FIG. 6 is a front perspective view of the fiber distribution terminal of FIG. 3 with the rotatable arrangement assembled on the base;

FIG. 7 is a front perspective view of the fiber distribution terminal of FIG. 3 with an example optical splitter exploded from the rotatable arrangement;

FIG. 8 is a perspective view of a first example splitter module suitable for use as the optical splitter in FIG. 7;

FIG. 9 is a perspective view of a second example splitter module suitable for use as the optical splitter in FIG. 7;

FIG. 10 is a front perspective view of the fiber distribution terminal of FIG. 7 with the example optical splitter assembled to the rotatable arrangement;

FIG. 11 is a front perspective view of the fiber distribution terminal of FIG. 10 with patch cords plugged into adapter outputs of the optical splitter;

FIG. 12 is a front perspective view of another example fiber distribution terminal shown empty and with a cover removed;

FIG. 13 is a front perspective view of the fiber distribution terminal of FIG. 12 shown with a riser cable routed therethrough and a splice pigtail shown partially routed through the terminal;

FIG. 14 is a front perspective view of the fiber distribution terminal of FIG. 13 shown with an optical splitter mounted thereto and subscriber patch cords plugged into the outputs of the splitter;

FIG. 15 is a front perspective view of the fiber distribution terminal of FIG. 12 shown with a cover exploded out from a base of the fiber distribution terminal;

FIG. 16 is a front perspective view of a fiber distribution hub including optical splitters;

FIG. 17 is a further front perspective view of the fiber distribution hub of FIG. 16;

FIG. 18 is a perspective view like FIG. 16, without the enclosure shown;

FIG. 19 is a view like FIG. 17, without the enclosure shown;

FIG. 20 is a view like FIG. 18, showing several splitter trays pivoted upwardly to access a lower tray;

FIG. 21 is a further perspective view showing the pivoted trays;

FIG. 22 shows the arrangement of FIG. 20, with the splitter trays removed, and showing a splice tray;

FIG. 23 shows a further perspective view of the arrangement of FIG. 22;

FIG. 24 is a perspective view of one of the splitter trays, including two optical splitters and showing output cables connected to each of the optical splitters;

FIG. 25 is a top plan view of the splitter tray of FIG. 24;

FIG. 26 is a view of the splitter tray of FIG. 24, with the output cables not shown;

FIG. 27 is a top plan view of the arrangement of FIG. 26;

FIG. 28 shows the splitter tray of FIG. 26, without the optical splitters shown;

FIG. 29 is a top plan view of the arrangement of FIG. 28;

FIG. 30 is a front perspective view of another fiber distribution hub including optical splitters;

FIG. 31 is a front perspective view of a fiber distribution hub including optical splitters and fanouts;

FIG. 32 illustrates the fiber distribution hub of FIG. 31 with the cover thereof removed to show the internal features;

FIG. 33 illustrates one of the fanouts of the hub of FIG. 31 in isolation;

FIG. 34 illustrates the fanout of FIG. 33 with the cover thereof removed to show the internal features thereof;

FIG. 35 is a front, right side perspective view of one of the optical splitters of the hub of FIG. 31;

FIG. 36 is a rear, left side perspective view of the optical splitter of FIG. 35;

FIG. 37 illustrates the optical splitter of FIGS. 35-36 with the cover thereof removed to show the internal features thereof;

FIG. 38 is a front perspective view of another fiber distribution hub including optical splitters;

FIG. 39 shows the fiber distribution hub of FIG. 38, with a cover partially removed;

FIG. 40 shows a basepart of the fiber distribution hub of FIG. 38;

FIG. 41 shows one splitter usable in the fiber distribution hub of FIG. 39;

FIG. 42 shows another splitter usable in the fiber distribution hub of FIG. 38;

FIG. 43 shows the basepart with splitter modules mounted to the basepart;

FIG. 44 illustrates splicing of connectorized pigtails to a riser cable in a splice cassette;

FIG. 45 shows a splice tray with integrated cable termination;

FIG. 46 is another view of the splice tray with integrated cable termination;

FIG. 47 shows the splice tray terminated to two different cables;

FIG. 48 is a top view of the splice tray of FIG. 47 terminated to two different cables;

FIGS. 49A-49C show the splice cassette pivoting relative to the cable termination bracket;

FIG. 50 shows the splice tray terminated to a cable and including a strength member termination;

FIG. 51 shows the basepart including splitters, and splice trays with integrated cable terminations along with representative cables;

FIG. 52 shows the mounting of the splice trays and cable terminations to the basepart;

FIG. 53 shows the various cables which can be connected to the hub, and the pivoting movement of the splice cassettes to access a selected splice cassette;

FIG. 54 shows the internal components of the hub with representative cables;

FIG. 55 is a front view of the internal components of the hub of FIG. 54;

FIG. 56 shows an alternative embodiment of a fiber distribution terminal;

FIG. 57 shows the fiber distribution terminal of FIG. 56 without the outer cover;

FIG. 58 shows the fiber distribution terminal of FIG. 57, without the internal cover, and illustrating a single splice to a single output cable from the riser cable, and a single output cable;

FIG. 59 shows the fiber distribution terminal of FIG. 56 including a plurality of outputs and including an internal splitter;

FIG. 60 shows a splitter module being mounted to the adapter to create multiple outputs from a single splice from the riser cable;

FIG. 61 shows the splitter mounted to the base;

FIGS. 62-69 show various views of an alternative embodiment of a fiber distribution terminal including a splitter which connects to an adapter which is connected to a connector spliced to the riser cable;

FIGS. 70 and 71 show a splitter module including connector storage for storage of a connectorized cable.

DETAILED DESCRIPTION

Reference will now be made in detail to the exemplary aspects of the present disclosure that are illustrated in the accompanying drawings. Wherever possible, the same reference numbers will be used throughout the drawings to refer to the same or like structure.

Referring to FIG. 1A, an example fiber optic distribution system 10 in accordance with the principles of the present disclosure is shown. The fiber optic distribution system 10 is shown incorporated into a building, such as a multi-dwelling unit (MDU) 12, having multiple floors 12 a, 12 b, 12 c and 12 d (i.e., multiple levels). The floor 12 a can be a basement. A riser 14 can run between the various floors 12 a-12 d. While depicted in an MDU, it will be appreciated that the fiber distribution system 10 can be used in other types of buildings and other types of applications.

The fiber distribution system 10 is shown including a fiber distribution hub 20 installed at the floor 12 a (e.g., typically in the basement or lowest floor of the building). The fiber distribution hub 20 is shown receiving at least one feed fiber 22 routed from a service provider 21 (e.g., from a central office of a service provider). The fiber distribution hub 20 can include a housing 24 that is capable of receiving one or more optical splitters 26. Each optical splitter 26 is configured to split optical signals supplied to the fiber distribution hub 20 by the feed fiber 22. In various implementations, an optical splitter mounted at the hub 20 can be a 1:2 splitter, a 1:4 splitter, a 1:8 splitter, a 1:16 splitter, a 1:32 splitter, and/or a 1:64 splitter. Outputs of the optical splitter 26 can be optically connected to optical fibers routed to the various floors 12 b-12 d of the building.

The optical splitters 26 can be incrementally installed at the hub 20 as service is needed. For example, the hub 20 may initially be devoid of splitters 26. When one or more subscribers request service, one or more splitters 26 may be installed at the hub 20. In some implementations, the splitters 26 have output pigtails extending therefrom that can connect at adapters to the optical fibers routed to the floors 12 b-12 d. In other implementations, the splitters 26 have output adapters configured to receive connectorized ends of the optical fibers routed to the various floors 12 b-12 d or intermediate fibers. The splitter input also may include a connectorized pigtail, an unconnectorized pigtail, or an adapter. The housing 24 can also enclose various structures for making optical connections between optical fibers of optical cables. For example, the housing can include a plurality of fiber optic adapters for connecting fiber optic connectors, splice trays for protecting optical splices between optical fibers, or other types of structures.

The fiber distribution system 10 is shown including fiber distribution terminals 30 at each of the upper floors 12 b-12 d. Fiber optic cables 40 interconnect the fiber distribution hub 20 and the fiber distribution terminals 30. The fiber optic cables 40 can each include one or more optical fibers contained within a protective jacket. The optical fibers of the fiber optic cables 40 can be optically coupled to the feed fiber 22 through the optical splitter 26 at the hub 20. At the fiber distribution terminals 30, the fiber optic cables 40 can be optically coupled to patch cords 50, which can be routed (e.g., horizontally along the floor) to optical network terminals (ONT's) 60 or other types of interface devices (e.g., an interface box, an interface panel, etc.) corresponding to different subscriber locations (e.g., apartments, residences, offices, condominiums, etc.) on each floor 12 a-12 d. An ONT 60 is an active device that converts optical signals from the service provider to electrical signals used at the subscriber locations.

If the fiber optic cables 40 contain single optical fibers, then optical splitters 70 can be provided in each of the fiber distribution terminals 30 for splitting signals carried by the optical fibers of the fiber optic cables 40. The patch cords 50 are optically coupled to the splitters 70 to carry the split signals to the ONT's 60. In some implementations, the optical splitters 70 splits the signals to connectorized pigtails housed within the fiber distribution terminals 30, which are routed to adapters mounted within the fiber distribution terminals 30. In other implementations, the optical splitters 70 have output adapter ports at which the patch cords 50 can be inserted to receive the split signals. In certain implementations, the optical splitters 70 can provide a split ratio of at least 1:4. In one example, the optical splitters 70 can provide a split ratio of 1:8. In another example, the optical splitters 70 can provide a split ratio of 1:4. In another example, the optical splitters 70 can provide a split ratio of 1:16.

The patch cords 50 can include first and second connectorized ends 50 a, 50 b. In some implementations, the first connectorized ends 50 a are optically connected to the connectorized pigtails within the fiber distribution terminals 30 by fiber optic adapters within the fiber distribution terminals 30. In other implementations, the first connectorized ends 50 a are optically connected to splitter output adapters within the fiber distribution terminals 30. The second connectorized ends 50 b of the patch cords 50 can be coupled to the ONT's 60.

In other examples, the fiber optic cables 40 can each include a plurality of optical fibers that are optically connected to the feed fiber 22. For such examples, the fiber distribution terminals 30 can include fan-out devices (e.g., fan-out modules) that separate the optical fibers of the fiber optic cables 40 routed to each fiber distribution terminal 30 into a plurality of connectorized pigtails that can be optically connected to subscriber locations via patch cords 50 as described above. The ends of the fiber optic cables 40 that interface with the fiber distribution hub 20 can be terminated with multi-fiber fiber optical connectors. In this type of example, all of the optical splitting of the building can be accomplished at the fiber distribution hub 20. In contrast, the previous example uses a distributed optical splitting strategy where optical splitting can occur at the fiber distribution hub 20 and/or at each floor 12 b-12 d.

In some implementations, all of the components of the fiber distribution system 10 are installed within the MDU 12 simultaneously. In other implementations, however, some of the components are initially installed and other components are installed only after those components are needed for service. For example, FIG. 1B shows the fiber distribution system 10 after an initial installation but prior to a service request from any of the floors 12 b-12 d in accordance with some implementations. The fiber optic cables 40 are routed from the fiber distribution terminals 30 to the hub 20. However, none of the fiber distribution terminals 30 include optical splitters 70 and no patch cords 50 have been installed. When service is requested by one of the ONT's 60, a splitter 70 can be installed at the corresponding fiber distribution terminal 30 and a patch cord 50 can be routed between the splitter 70 and the ONT 60.

FIGS. 2-11 show an example fiber distribution terminal 100 that is one example of a configuration for the fiber distribution terminals 30 of FIG. 1A. The fiber distribution terminal 100 includes a housing 101 having a base 102 and a front cover 104. The front cover 104 is movable (e.g., pivotally moveable) relative to the base 102 between an open position and a closed position (see FIG. 2). In certain implementations, the front cover 104 is removable from the base 102. The fiber distribution terminal 100 also includes a rotatable arrangement 106 positioned within housing 101. The rotatable arrangement 106 can rotate relative to the housing 101 about an axis of rotation 108 (FIG. 4). The rotatable arrangement 106 can be rotatably mounted on a spindle 109 coupled to the base 102 and aligned along the axis of rotation 108 (See FIG. 5).

Referring to FIGS. 3-5, the rotatable arrangement 106 includes a spool 110 and a management tray 120 that rotate unitarily with each other. The spool 110 includes a drum portion 112 about which the fiber optic cable 40 is coiled. The spool 110 also includes a flange 114 that retains the cable 40 on the spool 110. The spool 110 includes a second flange spaced from the first flange 114 along the axis of rotation 108. In some implementations, the second flange forms a management tray 120 at which the cable 40 is coupled to the patch cords 50. In one example, the fiber optic cable 40 can include a single optical fiber and can include a first end 40 a (FIG. 3) that is connectorized by a single fiber optical connector (e.g., an SC connector, an LC connector, etc.). The first end 40 a of the fiber optic cable 40 can be routed to the fiber distribution hub 20 for connection to the feed fiber 22 as described above.

The fiber management tray 120 includes a base 121 extending generally parallel with the flange 114. The base 121 defines an aperture 122 through which a second end 40 b of the fiber optic cable 40 can be routed to an opposite side of the base 121 from the spool 110. In certain implementations, a bend radius limiter extends rearwardly from the base 121 at the aperture 122 to inhibit excessive bending of the cable 40 when the cable 40 transitions through the aperture 122. The base 121 also defines a channel 123 or other structures for providing fiber bend radius protection for routing the second end 40 b of the cable 40 to a holding location 124 on the management tray 120. In some implementations, the cable second end 40 b is connectorized by a single fiber optical connector (e.g., an SC connector, an LC connector, etc.). In such implementations, an adapter 125 can be disposed at the holding location 124 and the connectorized end 40 b can be inserted into one port of the adapter 125 (see FIG. 3).

To deploy the fiber distribution terminal 100, the terminal 100 is positioned at the desired floor 12 b-12 d and the fiber optic cable 40 is paid off from the spool 110 by pulling on the first end 40 a of the fiber optic cable 40. The first end 40 a of the fiber optic cable 40 is pulled down the riser 14 to the fiber distribution hub 20. As the fiber optic cable 40 is paid off from the spool 110, the rotatable arrangement 106 rotates relative to the housing 101 about the axis of rotation 108 defined by the spindle 109. The management tray 120, the adapter 125, and the second end 40 b of the cable 40 are carried with the rotatable arrangement 106 and rotate in unison with (i.e., in concert with) the rotatable arrangement 106 about the axis of rotation 108 as the fiber optic cable 40 is paid off from the rotatable arrangement 106 (see FIG. 6).

After the cable 40 has been connected to the fiber distribution hub 20, the second end 40 b of the cable 40 remains at the adapter 125 awaiting a subscriber on the relevant floor 12 b-12 d to request service. In certain implementations, the rotatable arrangement 106 can be rotationally locked in position when the cable is dispensed. Upon a request for service, an optical splitter 70 can be installed on the management tray 120 (see FIG. 7). The optical splitter 70 includes a body/housing 71 having at least one input region 72 and at least one output region 74. The optical splitter body 71 also defines a connection interface 75 that mounts the splitter body 71 to the base 121 of the tray 120. For example, the connection interface 75 may couple to a mounting interface 126 (e.g., latches, snaps, dove tail, etc.) on the tray 120 (see FIG. 5). In certain implementations, the terminal 100 includes surrounding structure that holds the splitter body 71 in position.

FIGS. 8 and 9 illustrate example implementations of optical splitters 130, 140, respectively, that are examples of configurations for the optical splitters 70 of FIG. 7. Each of the optical splitters 130, 140 has a common peripheral profile despite having a different number of output ports. Accordingly, either of the optical splitters 130, 140 can fit into the same space within a terminal 30, hub 20, or other enclosure. In the example shown, the input port of the optical splitter 130, 140 is disposed at a common side with the output ports. In other implementations, however, the input port can be disposed at a different side of the splitter 130, 140 from the output ports. In certain implementations, the optical splitters 130, 140 can include multiple input ports.

As shown in FIG. 8, the example optical splitter module 130 has a splitter body/housing 131 defining an input region 132 and an output region 134. In the example shown, the input region 132 includes an adapter defining an empty port at which the connectorized end 40 a of the cable 40 can be received. For example, the connectorized end 40 a can be stored at a fixed location within the distribution terminal 100 so that mounting the splitter 130 to the terminal 100 causes the connectorized end 40 a to enter the adapter. The opposite end of the adapter receives a connectorized end of an internal fiber leading to an optical splitter within the housing 131. In other implementations, the input region 132 may include the connectorized end of an internal fiber leading to the optical splitter within the housing 131 (see FIG. 9). In the example shown, the output region 134 includes multiple adapter output ports 135 at which first ends 50 a of the patch cords 50 can be received. In the example shown, the output region 134 includes four adapter output ports 135.

As shown in FIG. 9, the example optical splitter module 140 has a splitter body/housing 141 defining an input region 142 and an output region 144. In the example shown, the input region 142 includes a connectorized end 143 of an internal fiber leading to an optical splitter within the housing 141. The connectorized end 143 is configured to be received at the adapter 125 when the splitter module 140 is installed at the tray 120 (see FIG. 10). In other implementations, the input region 142 may include an adapter defining an empty outward-facing port, such as that shown in FIG. 8. In the example shown, the output region 144 includes multiple adapter ports 145 at which first ends 50 a of the patch cords 50 can be received. In the example shown, the output region 144 includes eight adapter output ports 145.

In some implementations, the splitter body 131 of the splitter module 130 has the same dimensions as the splitter body 141 of the splitter module 140. In certain implementations, the output region 134 of the splitter module 130 has the same dimensions as the output region 144 of the splitter module 140 (e.g., compare FIGS. 8 and 9). In some such implementations, the adapter ports of the output region 134 accommodating fewer output paths are more spaced apart than the adapter ports of the output region 144 accommodating more output paths. In some such implementations, the adapter ports of the output region 134 accommodating fewer output paths can include SC-type adapters and the adapter ports of the output region 144 accommodating more output paths can include LC-type adapters, LX.5-type adapters, or other such high density adapters.

Installing the optical splitter modules 70, 130, 140 only when service is needed reduces the initial installation cost of the network. Furthermore, locating the adapters 135, 145 on the splitters 70, 130, 140 further reduces the initial installation cost of the network by reducing the number of components that must be installed at the fiber distribution terminals 100 before service is requested. In addition, the optical splitter modules 70, 130, 140 described above also can be installed at the fiber distribution hub 20 as the optical splitters 26. For example, the optical splitters 70, 130, 140 of the fiber distribution terminals 100 can be interchangeable with the splitters 26 at the fiber distribution hub 20.

As shown in FIG. 11, the patch cords 50 can be used to connect the ONT's 60 to the fiber distribution terminal 100. For example, the first ends 50 a of the patch cords 50 can be inserted into the output ports 135, 145 of the splitter module 70, 130, 140 as needed. For example, the patch cords 50 can be routed onto the tray 120 through ports 127 (see FIG. 5). A gasket or other sealing member can be provided at the ports 127 to weather-proof the interior of the fiber distribution terminal 100. After deployment of the fiber distribution terminal 100, any remaining unused length of the fiber optic cable 40 can remain coiled on the drum portion of the rotatable arrangement 106 for storage within the housing 101 of the fiber distribution terminal 100.

FIGS. 12-15 illustrate an alternative type of fiber distribution terminal 200 for use in a fiber distribution system in which a single cable or cable assembly 90 is routed from the hub 20 to the terminals 200 on each floor 12 b-12 d. The example terminal 200 does not include a rotatable cable storage spool.

Rather, the terminal 200 includes a base 202 defining a channel 203 through which the cable assembly 90 can be routed. The channel 203 defines a breakout region 201 at which an optical fiber of the cable assembly 90 can be accessed and pulled into the base 202. The breakout region 201 leads to a routing passage 206 that provides slack storage around a spool or bend radius limiter 207. A splicing passage 208 leads from the routing passage 206 to one or more optical splice holders 209. A pigtail passage 205 also connects to the routing passage 206 and/or to the splicing passage 208. The pigtail passage 205 extends to a holding location 224 that is configured to hold an optical adapter 225 (FIG. 13).

As shown in FIG. 13, the cable assembly 90, which is routed through the MDU 12 along a riser or other ducting, is disposed within the base channel 203. An optical adapter 225 is mounted to the holding location 224. A connectorized end 94 of a splice pigtail 92 is plugged into one port of the optical adapter 225. The remaining length of the splice pigtail 92 is routed through the pigtail passage 205 to the splicing passage 208. In certain implementations, excess length of the splice pigtail 92 can be stored in the routing passage 206 before the unconnectorized end of the splice pigtail 92 is routed to the splicing passage 208. An optical fiber can be broken out from the cable assembly 90, routed through the breakout region 201, along the routing passage 206, to the splicing passage 208. The optical fiber of the cable assembly 90 can be spliced (e.g., mechanical splice, fusion splice, etc.) to the splice pigtail 92 and stored at one of the splice holders 209. Thereby, optical signals are carried from the hub 20, along the fiber of the cable assembly 90, along the splice pigtail 92, to the second port of the optical adapter 225.

As shown in FIG. 14, an optical splitter 70 can be mounted to the base 202 of the terminal 200. Any of the optical splitters 70, 130, 140 described herein are suitable for mounting to the base 202. The input connector 73 of the splitter 70 plugs into the second port of the adapter 225 to receive the optical signals from the hub 20. One or more patch cords 50 can be plugged into the output ports at the splitter output region 74 to carry the split optical signals to the ONTs 60. As shown in FIG. 15, a cover 204 can be mounted to the base 202 before and/or after the splitter 70 is mounted to the terminal 200. The cover 204 provides protection to the splitter 70, fibers, and connections contained within the terminal 200.

Referring now to FIGS. 16-29, a fiber distribution hub 300 is shown having an enclosure 302 and a door 304, which hingedly mounts to enclosure 302. A fiber feed 22 enters fiber distribution hub 300 for connection to optical splitters 306. Outputs from the optical splitters 306 are shown as fiber optic cables 40, which route to one or more fiber distribution devices that are installed at different locations within a building. For example, fiber distribution hub 300 can be located in a basement. Fibers from fiber feed 22 can be spliced at splice tray 308 to splitter inputs 310, which lead to each splitter tray 312. Each splitter tray 312 holds one or more splitters 306 with a mounting device like the type noted above for terminals 100, 200. Splitters 306 in the example include one input 328 and eight outputs 330. Splitters 306 are constructed in a similar manner as previously described optical splitters 70, 130, 140. Splitter 306 is interchangeable with splitters 70, 130, 140.

Splice tray 308 and splitter trays 312 are mounted to a backing plate 316. Splitter trays 312 are pivotally mounted so as to permit access to a desired splitter tray in the stack of splitter trays 312. The pivoting splitter trays 312 can also allow access to splice tray 308 as desired. Each splitter tray 312 holds two optical splitters 306 and the respective splitter inputs 328.

As shown, each splitter tray 312 includes cable routing for routing of the splitter inputs 328, which are outputs from the splice tray in one example. The routing pathways 320 extend around a perimeter of splitter tray 312. Cable routing 320 can include cable management troughs 322, fingers 324 and rings 326. Splice tray 308 includes a fiber input 332 and a fiber output 334. Splice tray 308 opens up and allows internal storage of the fiber splice.

Fiber distribution hubs 20, 300 are shown as centralized hubs for feed fiber 22. In some cases, feed fiber 22 can be split out to multiple hubs so as to distribute the splitting and splicing functions among multiple hubs 20, 300. In either case, splitters 70, 130, 140, 306, can be used throughout the system, in the hubs and in the local devices.

FIG. 30 illustrates another fiber distribution hub 400 similar to the hub 300 illustrated in FIGS. 16-29. The fiber distribution hub 400 includes an enclosure 402 and is shown without a cover to illustrate the internal features thereof. In the fiber distribution hub 400, the optical splitters 406 are oriented in a horizontally stacked arrangement adjacent the bottom 401 of the enclosure 402. The optical splitters 406 are arranged in a direction from a front 403 of the hub 400 toward a back 405 of the hub 400. As in the hub 300 of FIGS. 16-29, the optical splitters 406 are configured to receive an input signal from a fiber feed 22 that enters fiber distribution hub 400. In the example of the hub 400, fiber feeds 22 enter from sides 407, 409 of the enclosure 402 and fibers from the fiber feed 22 are spliced to splitter inputs 410 at a splice region 408 within the enclosure 402. Outputs from the optical splitters 406 are shown as fiber optic cables 40, which exit the enclosure from a top 411 and route to one or more fiber distribution devices that are installed at different locations within a building. For example, as in hub 300, hub 400 can be located in a basement. Each of the splitters 406 may be mounted to the enclosure 402 with a mounting device like the type noted above for terminals 100, 200, and 300. Splitters 406 in the example include one input 410 and eight outputs 430. Splitters 406 are constructed in a similar manner as previously described optical splitters 70, 130, 140, and 306. Splitter 406 is interchangeable with splitters 70, 130, 140, and 306.

Referring now to FIGS. 31-37, another fiber distribution hub 500 similar to the hub 400 illustrated in FIG. 30 is shown. The fiber distribution hub 500 includes an enclosure 502 for housing fiber optic splitters 506 in a manner similar to the arrangement shown in FIG. 30. In FIG. 32, the enclosure 502 is shown without a cover 504 to illustrate the splitters 506 located within the enclosure 502. In the fiber distribution hub 500, in addition to the splitters 506, a plurality of fanouts 580 are located above the enclosure 502. The fanouts 580 are oriented in a stacked arrangement similar to the splitters 506 therebelow in a direction from the front 503 of the hub 500 toward the back 505 of the hub 500. As in the hub 400 of FIG. 30, fiber feed 22 enters fiber distribution hub 500 for connection to the optical splitters 506. Similar to the hub 400 of FIG. 30, the fiber feed 22 enters from the sides 507, 509 of the enclosure 502 and fibers from the fiber feed 22 are spliced to splitter inputs 510 at a splice region 508 within the enclosure 502. However, in contrast to the arrangement shown in FIG. 30, the riser cables 40 are spliced into pigtails at the fanouts 580 located above the enclosure 502. The connectorized pigtails then lead to the outputs 530 of the splitters 506. In this manner, the riser cables 40 do not have to be preterminated with connectors, which can often lead to issues in providing the correct length for the individual cables.

The fanouts 580 are shown in isolation in FIGS. 33 and 34. Each fanout 580 includes a riser cable port 582 at a top 581 of the fanout 580 and a pigtail port 584 at a bottom 583 of the fanout 580. A splice region 585 is provided within the fanout 580 as well as a cable management spool 587 for managing fibers within the fanout 580 without violating minimum bend radius requirements.

The splitters 506 are shown in isolation in FIGS. 35-37. The splitter 506 is shown in FIG. 37 without a cover 511 thereof for illustrating the internal structure thereof. In the depicted example of the hub 500, the splitters 506 are 1×16 splitters. As in the earlier described embodiments, each splitter 506 may be mounted to the enclosure 502 with a mounting device like the type noted above. Splitters 506 are constructed in a similar manner as previously described optical splitters 70, 130, 140, 306, and 406. Splitter 506 is interchangeable with splitters 70, 130, 140, 306, and 406.

Referring now to FIGS. 38-55, another fiber distribution hub 600 is shown. The fiber distribution hub includes an enclosure 602 including a basepart 604 and a cover 606. In the illustrated embodiment, cables enter and exit from the sides of hub 600. Basepart 604 includes a first major side 650, a second major side 652 generally parallel to first major side 650, a first minor side 654, and a second minor side 656 oppositely disposed to first minor side 654. First minor side 654 and second minor side 656 extend generally perpendicularly between first major side 650 and second major side 652. Basepart 604 includes a splitter area 608 on each side of basepart 604, a cable management area 610 adjacent each splitter area, and a central channel 612. Central channel 612 communicates with upper cable termination and splice tray area 614. Basepart 604 can be wall mounted if desired.

As shown in FIGS. 41 and 42, first example splitter 616 includes an input 618 and a plurality of outputs 620 in the form of adapters. First splitter 616 mounts with flanges 622 to basepart 604. A second splitter 624 includes two inputs 618 and a plurality of outputs 620 in the form of adapters. First splitter 616 is a 1×16 splitter. Second splitter 624 is a 2×1×8 splitter. FIG. 43 shows a plurality of second splitters 624 mounted to basepart 604.

FIG. 44 illustrates a riser cable which can be spliced to pigtails for connection to the splitter outputs 620 of hub 600. The riser cable can also be provided with connectorized pigtails without the need for a splice or splice cassette.

In FIGS. 45 through 55, a splice tray with integrated cable termination 626 is shown. Splice tray 626 includes a cable termination bracket 628 and a pivotally mounted splice cassette 630 for holding cable and splices. Cables entering and exiting splice tray 626 are terminated on cable termination bracket 628. For example, a riser cable 638 or a feeder cable 634 is connected at an outside portion of cable termination bracket 628. In the example shown, an opposite end of cable termination bracket 628 is connected to connectorized pigtails 636, 640.

FIGS. 49A-C show pivoting movement of splice cassette 630 relative to cable termination bracket 628.

A strength member termination device 632 can be used with cable termination bracket 628 to terminate certain cables, such as feeder cables or riser cables.

FIG. 51 illustrates the cable routing from feeder cable 634 to pigtails 636 which are used as inputs to splitters 616, 626. Splicing of the feeder cables to the pigtails occurs on splice cassette 630. Riser cables 638 can also be provided as part of hub 600 for connecting to pigtails (spliced on) which are connected to the outputs of the splitters 616, 624.

Referring now to FIG. 52, splice tray 626 is shown being mounted to basepart 604 with fasteners wherein the cables 634, 636, 638, 640 are positioned in a recess 644.

Referring now to FIG. 53, several of the splice cassettes 630 are shown pivoted upwardly to allow for access to a selected lower splice cassette 630. FIG. 53 also illustrates the feeder cable 634 which is an input to one or more of the splitters, and the output riser cables 638. Each of the feeder cable 634 and the riser cables 634 are spliced to connectorized pigtails which are connected through splitters 616, 624 as inputs, and outputs, respectively. In a further example, an external drop cable 646 can be provided for connection to one or more splitters 616, 624 as desired.

As shown in FIGS. 56-69, a fiber distribution terminal 700 includes a base 702, and an external cover 704. An internal cover 706 is positioned over a cable area 708 which covers a splice 710 and cable 711 from riser cable 709. A connector 712 extends from splice 710 and mates with adapter 714. Output connector 715 with cable connects to connector 712 to provide service to a single customer or outlet.

If additional customers or outlets are in need of service, a splitter 716 can be used instead of output connector 715. Splitter 716 includes a plurality of outputs 718 each with an output adapter 717 matable to an output connector 715 with cable.

A splitter input connector 720′ is illustrated in the modified version of fiber distribution terminal 700′ shown in FIGS. 62-69. Similar parts are noted with an apostrophe in FIGS. 62-69 relative to FIGS. 56-61. The splitter input connector 720 is on the rear of splitter 716 and not visible in FIGS. 56-61. Splitter 716 mounts with a sliding motion in the illustrated examples. Splitter 716 can be easily added after installation of terminal 700, when single service is no longer needed, and additional outputs are desired for servicing multiple customers or multiple units/outlets.

The splitter 716′ of FIGS. 62-69 includes a base 740, a front cover 742, and an intermediate tray 744. Tray 744 holds output connector 720′ and output adapters 717′.

Various features of splitters 716, 716′ are noted. As shown the splitter-outputs are adapters, and the splitter-input is a connector.

The splitter output and splitter input are in the opposite direction in one implementation.

The input-adapter is placed in the base (not in splitter) to be able to add a single customer pigtail, if desired.

The splitter output is facing downwards, and the splitter-input is upwards in one implementation.

The pigtail for a single customer (in case of no splitter) is leaving the box at the bottom (same exit-direction as for pigtail exit in case of a splitter) in one implementation.

The splitter output adapters are placed generally in the center of the splitter module, in one implementation

The splitter input connector is placed generally in the middle of the module but in a different height level; underneath the splitter out adapters in one implementation.

The output adapters of the splitter are placed vertically to keep the width small in one implementation.

The input connector is placed horizontally to keep height small in one implementation.

The pigtail boots clicked in the splitter out adapter (splitter out) are within the splitter footprint in one implementation.

The splitter has side bend-protection for the pigtail attached in the splitter adapter out ports in one implementation.

In one implementation, the width of the splitter is around 90 mm, the length is around 120 mm.

The adapters can be provided at a slight angle for extra access by the user in one implementation.

A sealing foam strip can be added to the splitter to close the pigtail opening between splitter and outer cover which can be added over the splitter like cover 704 in one implementation.

A fixating screw can be added to fix the splitter to the base; with the screw direction is aligned with the feeder-adapter mating direction in one implementation.

Referring now to FIGS. 70 and 71, splitter 816 includes inputs 818 in the form of adapters, and splitter outputs 820 in the form of adapters. Splitter 816 also includes one or more connector storage locations 840. Two locations 840 are shown for splitter 816. Each location 840 can store a connector 842 for later use as an output connector for outputs 820. Such a situation can occur if the connector or cable in one of outputs 820 becomes damaged. Connector 842 can be used to change out the damaged connector/cable and provide a ready to use back up signal path. Location 840 stores an end of connector 842 in a protective manner and also keeps it organized for a future deployment. Connector 842 is an extra pigtail of the riser cable in one example.

In one implementation, location 840 is located close to the central channel of the hub.

With the above systems, splitters can be mounted in a hub and/or in an MDU or floor box as desired. Various of the systems provide flexibility for adding splitters as needed after initial installation of the system. Various of the systems utilize splicing for adding pigtails to cables which are not preconnectorized. However, the above systems can be used with preconnectorized cables, in the case of feeder, riser, or other.

Various modifications and alterations of this disclosure will become apparent to those skilled in the art without departing from the scope and spirit of this disclosure, and it should be understood that the scope of this disclosure is not to be unduly limited to the illustrative examples set forth herein.

LIST OF REFERENCE NUMERALS AND CORRESPONDING FEATURES

-   10 fiber optic distribution system -   12 multi-dwelling unit -   12 a-12 d floors -   14 a riser -   20 fiber distribution hub -   21 a service provider -   22 feed fiber -   24 a housing -   26 optical splitters -   30 fiber distribution terminals -   40 fiber optic cables -   40 a, 40 b first and second ends -   50 patch cords -   50 a, 50 b first and second connectorized ends -   60 optical network terminals -   70 optical splitter -   71 splitter body -   72 input region -   74 output region -   75 connection interface -   90 cable assembly -   92 splice pigtail -   94 connectorized end -   100 fiber distribution terminal -   101 a housing -   102 a base -   104 a front cover -   106 rotatable arrangement -   108 axis of rotation -   109 spindle -   110 spool -   112 drum portion -   114 flange -   120 management tray -   121 base -   122 aperture -   123 channel -   124 holding location -   125 adapter -   126 mounting interface -   127 ports -   130 optical splitter module -   131 splitter body -   132 input region -   134 output region -   135 adapter output port -   140 optical splitter module -   141 splitter body -   142 input region -   143 connectorized end -   144 output region -   145 adapter output port -   200 alternative fiber distribution terminal -   201 breakout region -   202 base -   203 channel -   204 cover -   205 pigtail passage -   206 routing passage -   207 spool -   208 splice passage -   209 splice holder -   224 holding location -   225 optical adapter -   300 fiber distribution hub -   302 enclosure -   304 door -   306 optical splitter -   308 splice tray -   310 splitter inputs -   312 splitter tray -   316 backing plate -   320 cable routings -   322 troughs -   324 fingers -   326 rings -   328 input to splitter -   330 outputs from splitter -   332 fiber input -   334 fiber output -   400 fiber distribution hub -   401 bottom -   402 enclosure -   403 front -   405 back -   406 splitter -   407 side -   408 splice region -   409 side -   410 splitter input -   411 top -   430 splitter output -   500 fiber distribution hub -   502 enclosure -   503 front -   504 cover -   505 back -   506 splitter -   507 side -   508 splice region -   509 side -   510 splitter input -   530 splitter output -   580 fanout -   581 top -   582 riser cable port -   583 bottom -   584 pigtail port -   585 splice region -   587 cable management spool -   600 fiber distribution hub -   602 enclosure -   604 base part -   606 cover -   608 splitter area -   610 cable management area -   612 central channel -   614 cable termination and splice tray area -   616 first splitter -   618 input -   620 outputs -   622 flanges -   624 second splitter -   626 splice tray -   628 cable termination bracket -   630 splice cassette -   632 strength member termination device -   634 feeder cable -   636 pigtails -   638 riser cable -   640 pigtails -   642 fasteners -   644 recess -   646 external drop cable -   700 fiber distribution terminal -   700′ modified fiber distribution terminal -   702 base -   704 external cover -   706 internal cover -   708 cable area -   709 riser -   710 splice -   711 cable -   712 connector -   714 adapter -   715 output connector -   716 splitter -   717 output adapter -   718 outputs -   720 splitter input connector -   740 base -   742 front cover -   744 intermediate tray -   816 splitter -   818 input to splitter -   820 outputs from splitter -   840 connector storage location -   842 connector 

What is claimed is:
 1. A fiber distribution hub comprising: an enclosure including a basepart and a cover, the basepart including a first major side, a second major side generally parallel to the first major side, a first minor side, and a second minor side oppositely disposed to the first minor side, wherein the first minor side and the second minor side extend generally perpendicularly between the first major side and the second major side; wherein the basepart includes first and second splitter areas located adjacent each of the respective first and second minor sides of the basepart, each of the first and second splitter areas being located adjacent the second major side of the basepart, the basepart also including first and second cable management areas, the respective first and second cable management areas being located adjacent the respective first and second splitter areas, and a central channel defined between the first and second cable management areas, the central channel communicating with an upper cable termination and splice tray area, the upper cable termination and splice tray area being positioned adjacent to the first major side of the basepart; a plurality of splitter modules located in each of the first and second splitter areas, each of the plurality of splitter modules including at least one input and a plurality of outputs in the form of adapters; a plurality of splice trays located in the upper cable termination and splice tray area and separate from the plurality of splitter modules, each of the plurality of splice trays including integrated cable termination, wherein the splice trays each include a cable termination bracket and a pivotally mounted splice cassette for holding cable and splices, wherein cables entering and exiting the splice trays are terminated on the cable termination bracket, and wherein a riser cable or a feeder cable is connected at an outside portion of the cable termination bracket, and an opposite end of the cable termination bracket is connected to connectorized pigtails.
 2. The fiber distribution hub of claim 1, wherein each splice cassette includes cable loop storage and cable splice holders.
 3. The fiber distribution hub of claim 1, wherein the plurality of splice trays are provided in two columns, wherein the connectorized pigtails are positioned in the central channel.
 4. The fiber distribution hub of claim 1, wherein the at least one input and a plurality of outputs in the form of adapters face a front of the hub.
 5. The fiber distribution hub of claim 1, wherein pivot axes of the splice cassettes extend horizontally and transversely to the front of the hub.
 6. The fiber distribution hub of claim 1, wherein axes of the cables entering the splice trays extend horizontally and transversely to the front of the hub.
 7. The fiber distribution hub of claim 1, wherein the cable management area and the splitter area are formed together as one piece. 